(defun fib (N)
    (cond 
	 ((= N 0) 0)
	 ((= N 1) 1)
	 ((= N 2) 1)
     ((> N 2) (+ (fib (- N 1)) (fib (- N 2))))))

(loop for i from 0 to 11 
 sum (fib (* i 3))
 )
